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Int. J. Electroactive Mater. 1 (2013) 60-63

Determination of Electron and Hole Mobility in Poly(3-hexylthiophene) Using Space-Charge-Limited-Current Measurements

Mohammad Ahmed, Ivo Hummelgen*

Departamento de Físicá, Universidade Federal do Paraná, Curitiba, PR, Brazil
*Email Address :

Abstract : Charge carrier mobility is one of the most crucial parameters of organic materials when device applications are considered. There is a strong interest in measuring the charge carrier mobility of organic semiconductor thin films using simple techniques such as from current-voltage I(V) measurements. This paper investigates transport characteristics of positive and negative charge carriers in poly(3-hexylthiophene) (P3HT) using I(V) measurements in metal/polymer/metal sandwich structures. In these devices, which exhibits space-charge-limited behavior, we find that the positive charge carrier mobility, using ITO/PEDOT:PSS/P3HT/Al (ITO: indium-tin oxide, PEDOT:PSS: Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate) devices, is μh = 1.35 × 10-4 cm2 V-1 s-1 and that the negative charge carrier mobility, using Al/CsO/P3HT/CsO/Al devices, is μn = 1.93 × 10-9 cm2 V-1 s-1. We also investigated current-thickness dependence of Al/CsO/P3HT/CsO/Al devices.

Keywords : Poly(3-hexylthiophene),hole mobility,electron mobility